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I encountered similar issue before. Go to Device Manager, try manually add it to this path to the USB device:
C:\altera\12.1\quartus\drivers\usb-blaster-ii\ (not the one layer below e.g. x32 or x64). The system will pick up from .inf and the correct x86 driver from there.
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Hi,
This problem caused from driver. The windows don't trust this Usb driver for "unsigned agreemet or certificated"
You must do that, You pluged-in the nano board than enter the "device manager" you can see nano board with notification (as unidentified). Than here right click "driver update" "from my computer" you must choose this dictory "
C:\altera\10.1\quartus\drivers" than click ok after that the driver problem is Ok.
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